/* GStreamer * * Copyright (C) 2001-2002 Ronald Bultje * 2006 Edgard Lima * * gstv4l2object.c: base class for V4L2 elements * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Library General Public License as published * by the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. This library is distributed in the hope * that it will be useful, but WITHOUT ANY WARRANTY; without even the * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR * PURPOSE. See the GNU Library General Public License for more details. * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, * USA. */ #ifdef HAVE_CONFIG_H #include #endif #include #include #include #include #include #ifdef HAVE_GUDEV #include #endif #include "v4l2_calls.h" #include "gstv4l2tuner.h" #ifdef HAVE_XVIDEO #include "gstv4l2xoverlay.h" #endif #include "gstv4l2colorbalance.h" #include "gst/gst-i18n-plugin.h" /* videodev2.h is not versioned and we can't easily check for the presence * of enum values at compile time, but the V4L2_CAP_VIDEO_OUTPUT_OVERLAY define * was added in the same commit as V4L2_FIELD_INTERLACED_{TB,BT} (b2787845) */ #ifndef V4L2_CAP_VIDEO_OUTPUT_OVERLAY #define V4L2_FIELD_INTERLACED_TB 8 #define V4L2_FIELD_INTERLACED_BT 9 #endif GST_DEBUG_CATEGORY_EXTERN (v4l2_debug); #define GST_CAT_DEFAULT v4l2_debug #define DEFAULT_PROP_DEVICE_NAME NULL #define DEFAULT_PROP_DEVICE_FD -1 #define DEFAULT_PROP_FLAGS 0 #define DEFAULT_PROP_TV_NORM 0 #define DEFAULT_PROP_CHANNEL NULL #define DEFAULT_PROP_FREQUENCY 0 enum { PROP_0, V4L2_STD_OBJECT_PROPS, }; const GList * gst_v4l2_probe_get_properties (GstPropertyProbe * probe) { GObjectClass *klass = G_OBJECT_GET_CLASS (probe); static GList *list = NULL; /* well, not perfect, but better than no locking at all. * In the worst case we leak a list node, so who cares? */ GST_CLASS_LOCK (GST_OBJECT_CLASS (klass)); if (!list) { list = g_list_append (NULL, g_object_class_find_property (klass, "device")); } GST_CLASS_UNLOCK (GST_OBJECT_CLASS (klass)); return list; } static gboolean init = FALSE; static GList *devices = NULL; #ifdef HAVE_GUDEV static gboolean gst_v4l2_class_probe_devices_with_udev (GstElementClass * klass, gboolean check, GList ** klass_devices) { GUdevClient *client = NULL; GList *item; if (!check) { while (devices) { gchar *device = devices->data; devices = g_list_remove (devices, device); g_free (device); } GST_INFO ("Enumerating video4linux devices from udev"); client = g_udev_client_new (NULL); if (!client) { GST_WARNING ("Failed to initialize gudev client"); goto finish; } item = g_udev_client_query_by_subsystem (client, "video4linux"); while (item) { GUdevDevice *device = item->data; gchar *devnode = g_strdup (g_udev_device_get_device_file (device)); gint api = g_udev_device_get_property_as_int (device, "ID_V4L_VERSION"); GST_INFO ("Found new device: %s, API: %d", devnode, api); /* Append v4l2 devices only. If api is 0 probably v4l_id has been stripped out of the current udev installation, append anyway */ if (api == 0) { GST_WARNING ("Couldn't retrieve ID_V4L_VERSION, silly udev installation?"); } if ((api == 2 || api == 0)) { devices = g_list_append (devices, devnode); } else { g_free (devnode); } g_object_unref (device); item = item->next; } g_list_free (item); init = TRUE; } finish: if (client) { g_object_unref (client); } *klass_devices = devices; return init; } #endif /* HAVE_GUDEV */ static gboolean gst_v4l2_class_probe_devices (GstElementClass * klass, gboolean check, GList ** klass_devices) { if (!check) { const gchar *dev_base[] = { "/dev/video", "/dev/v4l2/video", NULL }; gint base, n, fd; while (devices) { gchar *device = devices->data; devices = g_list_remove (devices, device); g_free (device); } /* * detect /dev entries */ for (n = 0; n < 64; n++) { for (base = 0; dev_base[base] != NULL; base++) { struct stat s; gchar *device = g_strdup_printf ("%s%d", dev_base[base], n); /* * does the /dev/ entry exist at all? */ if (stat (device, &s) == 0) { /* * yes: is a device attached? */ if (S_ISCHR (s.st_mode)) { if ((fd = open (device, O_RDWR | O_NONBLOCK)) > 0 || errno == EBUSY) { if (fd > 0) close (fd); devices = g_list_append (devices, device); break; } } } g_free (device); } } init = TRUE; } *klass_devices = devices; return init; } void gst_v4l2_probe_probe_property (GstPropertyProbe * probe, guint prop_id, const GParamSpec * pspec, GList ** klass_devices) { GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe); switch (prop_id) { case PROP_DEVICE: #ifdef HAVE_GUDEV if (!gst_v4l2_class_probe_devices_with_udev (klass, FALSE, klass_devices)) gst_v4l2_class_probe_devices (klass, FALSE, klass_devices); #else /* !HAVE_GUDEV */ gst_v4l2_class_probe_devices (klass, FALSE, klass_devices); #endif /* HAVE_GUDEV */ break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec); break; } } gboolean gst_v4l2_probe_needs_probe (GstPropertyProbe * probe, guint prop_id, const GParamSpec * pspec, GList ** klass_devices) { GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe); gboolean ret = FALSE; switch (prop_id) { case PROP_DEVICE: #ifdef HAVE_GUDEV ret = !gst_v4l2_class_probe_devices_with_udev (klass, FALSE, klass_devices); #else /* !HAVE_GUDEV */ ret = !gst_v4l2_class_probe_devices (klass, TRUE, klass_devices); #endif /* HAVE_GUDEV */ break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec); break; } return ret; } static GValueArray * gst_v4l2_class_list_devices (GstElementClass * klass, GList ** klass_devices) { GValueArray *array; GValue value = { 0 }; GList *item; if (!*klass_devices) return NULL; array = g_value_array_new (g_list_length (*klass_devices)); item = *klass_devices; g_value_init (&value, G_TYPE_STRING); while (item) { gchar *device = item->data; g_value_set_string (&value, device); g_value_array_append (array, &value); item = item->next; } g_value_unset (&value); return array; } GValueArray * gst_v4l2_probe_get_values (GstPropertyProbe * probe, guint prop_id, const GParamSpec * pspec, GList ** klass_devices) { GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe); GValueArray *array = NULL; switch (prop_id) { case PROP_DEVICE: array = gst_v4l2_class_list_devices (klass, klass_devices); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec); break; } return array; } #define GST_TYPE_V4L2_DEVICE_FLAGS (gst_v4l2_device_get_type ()) static GType gst_v4l2_device_get_type (void) { static GType v4l2_device_type = 0; if (v4l2_device_type == 0) { static const GFlagsValue values[] = { {V4L2_CAP_VIDEO_CAPTURE, "Device supports video capture", "capture"}, {V4L2_CAP_VIDEO_OUTPUT, "Device supports video playback", "output"}, {V4L2_CAP_VIDEO_OVERLAY, "Device supports video overlay", "overlay"}, {V4L2_CAP_VBI_CAPTURE, "Device supports the VBI capture", "vbi-capture"}, {V4L2_CAP_VBI_OUTPUT, "Device supports the VBI output", "vbi-output"}, {V4L2_CAP_TUNER, "Device has a tuner or modulator", "tuner"}, {V4L2_CAP_AUDIO, "Device has audio inputs or outputs", "audio"}, {0, NULL, NULL} }; v4l2_device_type = g_flags_register_static ("GstV4l2DeviceTypeFlags", values); } return v4l2_device_type; } #define GST_TYPE_V4L2_TV_NORM (gst_v4l2_tv_norm_get_type ()) static GType gst_v4l2_tv_norm_get_type (void) { static GType v4l2_tv_norm = 0; if (!v4l2_tv_norm) { static const GEnumValue tv_norms[] = { {0, "none", "none"}, {V4L2_STD_NTSC, "NTSC", "NTSC"}, {V4L2_STD_NTSC_M, "NTSC-M", "NTSC-M"}, {V4L2_STD_NTSC_M_JP, "NTSC-M-JP", "NTSC-M-JP"}, {V4L2_STD_NTSC_M_KR, "NTSC-M-KR", "NTSC-M-KR"}, {V4L2_STD_NTSC_443, "NTSC-443", "NTSC-443"}, {V4L2_STD_PAL, "PAL", "PAL"}, {V4L2_STD_PAL_BG, "PAL-BG", "PAL-BG"}, {V4L2_STD_PAL_B, "PAL-B", "PAL-B"}, {V4L2_STD_PAL_B1, "PAL-B1", "PAL-B1"}, {V4L2_STD_PAL_G, "PAL-G", "PAL-G"}, {V4L2_STD_PAL_H, "PAL-H", "PAL-H"}, {V4L2_STD_PAL_I, "PAL-I", "PAL-I"}, {V4L2_STD_PAL_DK, "PAL-DK", "PAL-DK"}, {V4L2_STD_PAL_D, "PAL-D", "PAL-D"}, {V4L2_STD_PAL_D1, "PAL-D1", "PAL-D1"}, {V4L2_STD_PAL_K, "PAL-K", "PAL-K"}, {V4L2_STD_PAL_M, "PAL-M", "PAL-M"}, {V4L2_STD_PAL_N, "PAL-N", "PAL-N"}, {V4L2_STD_PAL_Nc, "PAL-Nc", "PAL-Nc"}, {V4L2_STD_PAL_60, "PAL-60", "PAL-60"}, {V4L2_STD_SECAM, "SECAM", "SECAM"}, {V4L2_STD_SECAM_B, "SECAM-B", "SECAM-B"}, {V4L2_STD_SECAM_G, "SECAM-G", "SECAM-G"}, {V4L2_STD_SECAM_H, "SECAM-H", "SECAM-H"}, {V4L2_STD_SECAM_DK, "SECAM-DK", "SECAM-DK"}, {V4L2_STD_SECAM_D, "SECAM-D", "SECAM-D"}, {V4L2_STD_SECAM_K, "SECAM-K", "SECAM-K"}, {V4L2_STD_SECAM_K1, "SECAM-K1", "SECAM-K1"}, {V4L2_STD_SECAM_L, "SECAM-L", "SECAM-L"}, {V4L2_STD_SECAM_LC, "SECAM-Lc", "SECAM-Lc"}, {0, NULL, NULL} }; v4l2_tv_norm = g_enum_register_static ("V4L2_TV_norms", tv_norms); } return v4l2_tv_norm; } void gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class, const char *default_device) { g_object_class_install_property (gobject_class, PROP_DEVICE, g_param_spec_string ("device", "Device", "Device location", default_device, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_DEVICE_NAME, g_param_spec_string ("device-name", "Device name", "Name of the device", DEFAULT_PROP_DEVICE_NAME, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_DEVICE_FD, g_param_spec_int ("device-fd", "File descriptor", "File descriptor of the device", -1, G_MAXINT, DEFAULT_PROP_DEVICE_FD, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_FLAGS, g_param_spec_flags ("flags", "Flags", "Device type flags", GST_TYPE_V4L2_DEVICE_FLAGS, DEFAULT_PROP_FLAGS, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); /** * GstV4l2Src:brightness * * Picture brightness, or more precisely, the black level * * Since: 0.10.26 */ g_object_class_install_property (gobject_class, PROP_BRIGHTNESS, g_param_spec_int ("brightness", "Brightness", "Picture brightness, or more precisely, the black level", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE)); /** * GstV4l2Src:contrast * * Picture contrast or luma gain * * Since: 0.10.26 */ g_object_class_install_property (gobject_class, PROP_CONTRAST, g_param_spec_int ("contrast", "Contrast", "Picture contrast or luma gain", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE)); /** * GstV4l2Src:saturation * * Picture color saturation or chroma gain * * Since: 0.10.26 */ g_object_class_install_property (gobject_class, PROP_SATURATION, g_param_spec_int ("saturation", "Saturation", "Picture color saturation or chroma gain", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE)); /** * GstV4l2Src:hue * * Hue or color balance * * Since: 0.10.26 */ g_object_class_install_property (gobject_class, PROP_HUE, g_param_spec_int ("hue", "Hue", "Hue or color balance", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE)); /** * GstV4l2Src:norm * * TV norm * * Since: 0.10.31 */ g_object_class_install_property (gobject_class, PROP_TV_NORM, g_param_spec_enum ("norm", "TV norm", "video standard", GST_TYPE_V4L2_TV_NORM, DEFAULT_PROP_TV_NORM, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); } GstV4l2Object * gst_v4l2_object_new (GstElement * element, enum v4l2_buf_type type, const char *default_device, GstV4l2GetInOutFunction get_in_out_func, GstV4l2SetInOutFunction set_in_out_func, GstV4l2UpdateFpsFunction update_fps_func) { GstV4l2Object *v4l2object; /* * some default values */ v4l2object = g_new0 (GstV4l2Object, 1); v4l2object->type = type; v4l2object->formats = NULL; v4l2object->element = element; v4l2object->get_in_out_func = get_in_out_func; v4l2object->set_in_out_func = set_in_out_func; v4l2object->update_fps_func = update_fps_func; v4l2object->video_fd = -1; v4l2object->poll = gst_poll_new (TRUE); v4l2object->buffer = NULL; v4l2object->videodev = g_strdup (default_device); v4l2object->norms = NULL; v4l2object->channels = NULL; v4l2object->colors = NULL; v4l2object->xwindow_id = 0; return v4l2object; } static gboolean gst_v4l2_object_clear_format_list (GstV4l2Object * v4l2object); void gst_v4l2_object_destroy (GstV4l2Object * v4l2object) { g_return_if_fail (v4l2object != NULL); if (v4l2object->videodev) g_free (v4l2object->videodev); if (v4l2object->poll) gst_poll_free (v4l2object->poll); if (v4l2object->channel) g_free (v4l2object->channel); if (v4l2object->formats) { gst_v4l2_object_clear_format_list (v4l2object); } g_free (v4l2object); } static gboolean gst_v4l2_object_clear_format_list (GstV4l2Object * v4l2object) { g_slist_foreach (v4l2object->formats, (GFunc) g_free, NULL); g_slist_free (v4l2object->formats); v4l2object->formats = NULL; return TRUE; } static gint gst_v4l2_object_prop_to_cid (guint prop_id) { gint cid = -1; switch (prop_id) { case PROP_BRIGHTNESS: cid = V4L2_CID_BRIGHTNESS; break; case PROP_CONTRAST: cid = V4L2_CID_CONTRAST; break; case PROP_SATURATION: cid = V4L2_CID_SATURATION; break; case PROP_HUE: cid = V4L2_CID_HUE; break; default: GST_WARNING ("unmapped property id: %d", prop_id); } return cid; } gboolean gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object, guint prop_id, const GValue * value, GParamSpec * pspec) { switch (prop_id) { case PROP_DEVICE: g_free (v4l2object->videodev); v4l2object->videodev = g_value_dup_string (value); break; case PROP_BRIGHTNESS: case PROP_CONTRAST: case PROP_SATURATION: case PROP_HUE: { gint cid = gst_v4l2_object_prop_to_cid (prop_id); if (cid != -1) { if (GST_V4L2_IS_OPEN (v4l2object)) { gst_v4l2_set_attribute (v4l2object, cid, g_value_get_int (value)); } } return TRUE; } break; case PROP_TV_NORM: v4l2object->tv_norm = g_value_get_enum (value); break; #if 0 case PROP_CHANNEL: if (GST_V4L2_IS_OPEN (v4l2object)) { GstTuner *tuner = GST_TUNER (v4l2object->element); GstTunerChannel *channel = gst_tuner_find_channel_by_name (tuner, (gchar *) g_value_get_string (value)); if (channel) { /* like gst_tuner_set_channel (tuner, channel) without g_object_notify */ gst_v4l2_tuner_set_channel (v4l2object, channel); } } else { g_free (v4l2object->channel); v4l2object->channel = g_value_dup_string (value); } break; case PROP_FREQUENCY: if (GST_V4L2_IS_OPEN (v4l2object)) { GstTuner *tuner = GST_TUNER (v4l2object->element); GstTunerChannel *channel = gst_tuner_get_channel (tuner); if (channel && GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) { /* like gst_tuner_set_frequency (tuner, channel, g_value_get_ulong (value)) without g_object_notify */ gst_v4l2_tuner_set_frequency (v4l2object, channel, g_value_get_ulong (value)); } } else { v4l2object->frequency = g_value_get_ulong (value); } break; #endif default: return FALSE; break; } return TRUE; } gboolean gst_v4l2_object_get_property_helper (GstV4l2Object * v4l2object, guint prop_id, GValue * value, GParamSpec * pspec) { switch (prop_id) { case PROP_DEVICE: g_value_set_string (value, v4l2object->videodev); break; case PROP_DEVICE_NAME: { const guchar *new = NULL; if (GST_V4L2_IS_OPEN (v4l2object)) { new = v4l2object->vcap.card; } else if (gst_v4l2_open (v4l2object)) { new = v4l2object->vcap.card; gst_v4l2_close (v4l2object); } g_value_set_string (value, (gchar *) new); break; } case PROP_DEVICE_FD: { if (GST_V4L2_IS_OPEN (v4l2object)) g_value_set_int (value, v4l2object->video_fd); else g_value_set_int (value, DEFAULT_PROP_DEVICE_FD); break; } case PROP_FLAGS: { guint flags = 0; if (GST_V4L2_IS_OPEN (v4l2object)) { flags |= v4l2object->vcap.capabilities & (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OVERLAY | V4L2_CAP_VBI_CAPTURE | V4L2_CAP_VBI_OUTPUT | V4L2_CAP_TUNER | V4L2_CAP_AUDIO); } g_value_set_flags (value, flags); break; } case PROP_BRIGHTNESS: case PROP_CONTRAST: case PROP_SATURATION: case PROP_HUE: { gint cid = gst_v4l2_object_prop_to_cid (prop_id); if (cid != -1) { if (GST_V4L2_IS_OPEN (v4l2object)) { gint v; if (gst_v4l2_get_attribute (v4l2object, cid, &v)) { g_value_set_int (value, v); } } } return TRUE; } break; case PROP_TV_NORM: g_value_set_enum (value, v4l2object->tv_norm); break; default: return FALSE; break; } return TRUE; } static void gst_v4l2_set_defaults (GstV4l2Object * v4l2object) { GstTunerNorm *norm = NULL; GstTunerChannel *channel = NULL; GstTuner *tuner; if (!GST_IS_TUNER (v4l2object->element)) return; tuner = GST_TUNER (v4l2object->element); if (v4l2object->tv_norm) norm = gst_v4l2_tuner_get_norm_by_std_id (v4l2object, v4l2object->tv_norm); GST_DEBUG_OBJECT (v4l2object->element, "tv_norm=0x%" G_GINT64_MODIFIER "x, " "norm=%p", (guint64) v4l2object->tv_norm, norm); if (norm) { gst_tuner_set_norm (tuner, norm); } else { norm = GST_TUNER_NORM (gst_tuner_get_norm (GST_TUNER (v4l2object->element))); if (norm) { v4l2object->tv_norm = gst_v4l2_tuner_get_std_id_by_norm (v4l2object, norm); gst_tuner_norm_changed (tuner, norm); } } if (v4l2object->channel) channel = gst_tuner_find_channel_by_name (tuner, v4l2object->channel); if (channel) { gst_tuner_set_channel (tuner, channel); } else { channel = GST_TUNER_CHANNEL (gst_tuner_get_channel (GST_TUNER (v4l2object->element))); if (channel) { g_free (v4l2object->channel); v4l2object->channel = g_strdup (channel->label); gst_tuner_channel_changed (tuner, channel); } } if (channel && GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) { if (v4l2object->frequency != 0) { gst_tuner_set_frequency (tuner, channel, v4l2object->frequency); } else { v4l2object->frequency = gst_tuner_get_frequency (tuner, channel); if (v4l2object->frequency == 0) { /* guess */ gst_tuner_set_frequency (tuner, channel, 1000); } else { } } } } gboolean gst_v4l2_object_start (GstV4l2Object * v4l2object) { if (gst_v4l2_open (v4l2object)) gst_v4l2_set_defaults (v4l2object); else return FALSE; #ifdef HAVE_XVIDEO gst_v4l2_xoverlay_start (v4l2object); #endif return TRUE; } gboolean gst_v4l2_object_stop (GstV4l2Object * v4l2object) { #ifdef HAVE_XVIDEO gst_v4l2_xoverlay_stop (v4l2object); #endif if (!gst_v4l2_close (v4l2object)) return FALSE; if (v4l2object->formats) { gst_v4l2_object_clear_format_list (v4l2object); } return TRUE; } /* * common format / caps utilities: */ typedef struct { guint32 format; gboolean dimensions; } GstV4L2FormatDesc; static const GstV4L2FormatDesc gst_v4l2_formats[] = { /* from Linux 2.6.15 videodev2.h */ {V4L2_PIX_FMT_RGB332, TRUE}, {V4L2_PIX_FMT_RGB555, TRUE}, {V4L2_PIX_FMT_RGB565, TRUE}, {V4L2_PIX_FMT_RGB555X, TRUE}, {V4L2_PIX_FMT_RGB565X, TRUE}, {V4L2_PIX_FMT_BGR24, TRUE}, {V4L2_PIX_FMT_RGB24, TRUE}, {V4L2_PIX_FMT_BGR32, TRUE}, {V4L2_PIX_FMT_RGB32, TRUE}, {V4L2_PIX_FMT_GREY, TRUE}, {V4L2_PIX_FMT_YVU410, TRUE}, {V4L2_PIX_FMT_YVU420, TRUE}, {V4L2_PIX_FMT_YUYV, TRUE}, {V4L2_PIX_FMT_UYVY, TRUE}, {V4L2_PIX_FMT_YUV422P, TRUE}, {V4L2_PIX_FMT_YUV411P, TRUE}, {V4L2_PIX_FMT_Y41P, TRUE}, /* two planes -- one Y, one Cr + Cb interleaved */ {V4L2_PIX_FMT_NV12, TRUE}, {V4L2_PIX_FMT_NV21, TRUE}, /* The following formats are not defined in the V4L2 specification */ {V4L2_PIX_FMT_YUV410, TRUE}, {V4L2_PIX_FMT_YUV420, TRUE}, {V4L2_PIX_FMT_YYUV, TRUE}, {V4L2_PIX_FMT_HI240, TRUE}, /* see http://www.siliconimaging.com/RGB%20Bayer.htm */ #ifdef V4L2_PIX_FMT_SBGGR8 {V4L2_PIX_FMT_SBGGR8, TRUE}, #endif /* compressed formats */ {V4L2_PIX_FMT_MJPEG, TRUE}, {V4L2_PIX_FMT_JPEG, TRUE}, #ifdef V4L2_PIX_FMT_PJPG {V4L2_PIX_FMT_PJPG, TRUE}, #endif {V4L2_PIX_FMT_DV, TRUE}, {V4L2_PIX_FMT_MPEG, FALSE}, /* Vendor-specific formats */ {V4L2_PIX_FMT_WNVA, TRUE}, #ifdef V4L2_PIX_FMT_SN9C10X {V4L2_PIX_FMT_SN9C10X, TRUE}, #endif #ifdef V4L2_PIX_FMT_PWC1 {V4L2_PIX_FMT_PWC1, TRUE}, #endif #ifdef V4L2_PIX_FMT_PWC2 {V4L2_PIX_FMT_PWC2, TRUE}, #endif #ifdef V4L2_PIX_FMT_YVYU {V4L2_PIX_FMT_YVYU, TRUE}, #endif }; #define GST_V4L2_FORMAT_COUNT (G_N_ELEMENTS (gst_v4l2_formats)) static struct v4l2_fmtdesc * gst_v4l2_object_get_format_from_fourcc (GstV4l2Object * v4l2object, guint32 fourcc) { struct v4l2_fmtdesc *fmt; GSList *walk; if (fourcc == 0) return NULL; walk = gst_v4l2_object_get_format_list (v4l2object); while (walk) { fmt = (struct v4l2_fmtdesc *) walk->data; if (fmt->pixelformat == fourcc) return fmt; /* special case for jpeg */ if (fmt->pixelformat == V4L2_PIX_FMT_MJPEG || fmt->pixelformat == V4L2_PIX_FMT_JPEG #ifdef V4L2_PIX_FMT_PJPG || fmt->pixelformat == V4L2_PIX_FMT_PJPG #endif ) { if (fourcc == V4L2_PIX_FMT_JPEG || fourcc == V4L2_PIX_FMT_MJPEG #ifdef V4L2_PIX_FMT_PJPG || fourcc == V4L2_PIX_FMT_PJPG #endif ) { return fmt; } } walk = g_slist_next (walk); } return NULL; } /* complete made up ranking, the values themselves are meaningless */ /* These ranks MUST be X such that X<<15 fits on a signed int - see the comment at the end of gst_v4l2_object_format_get_rank. */ #define YUV_BASE_RANK 1000 #define JPEG_BASE_RANK 500 #define DV_BASE_RANK 200 #define RGB_BASE_RANK 100 #define YUV_ODD_BASE_RANK 50 #define RGB_ODD_BASE_RANK 25 #define BAYER_BASE_RANK 15 #define S910_BASE_RANK 10 #define GREY_BASE_RANK 5 #define PWC_BASE_RANK 1 /* This flag is already used by libv4l2 although * it was added to the Linux kernel in 2.6.32 */ #ifndef V4L2_FMT_FLAG_EMULATED #define V4L2_FMT_FLAG_EMULATED 0x0002 #endif static gint gst_v4l2_object_format_get_rank (const struct v4l2_fmtdesc *fmt) { guint32 fourcc = fmt->pixelformat; gboolean emulated = ((fmt->flags & V4L2_FMT_FLAG_EMULATED) != 0); gint rank = 0; switch (fourcc) { case V4L2_PIX_FMT_MJPEG: #ifdef V4L2_PIX_FMT_PJPG case V4L2_PIX_FMT_PJPG: rank = JPEG_BASE_RANK; break; #endif case V4L2_PIX_FMT_JPEG: rank = JPEG_BASE_RANK + 1; break; case V4L2_PIX_FMT_MPEG: /* MPEG */ rank = JPEG_BASE_RANK + 2; break; case V4L2_PIX_FMT_RGB332: case V4L2_PIX_FMT_RGB555: case V4L2_PIX_FMT_RGB555X: case V4L2_PIX_FMT_RGB565: case V4L2_PIX_FMT_RGB565X: rank = RGB_ODD_BASE_RANK; break; case V4L2_PIX_FMT_RGB24: case V4L2_PIX_FMT_BGR24: rank = RGB_BASE_RANK - 1; break; case V4L2_PIX_FMT_RGB32: case V4L2_PIX_FMT_BGR32: rank = RGB_BASE_RANK; break; case V4L2_PIX_FMT_GREY: /* 8 Greyscale */ rank = GREY_BASE_RANK; break; case V4L2_PIX_FMT_NV12: /* 12 Y/CbCr 4:2:0 */ case V4L2_PIX_FMT_NV21: /* 12 Y/CrCb 4:2:0 */ case V4L2_PIX_FMT_YYUV: /* 16 YUV 4:2:2 */ case V4L2_PIX_FMT_HI240: /* 8 8-bit color */ rank = YUV_ODD_BASE_RANK; break; case V4L2_PIX_FMT_YVU410: /* YVU9, 9 bits per pixel */ rank = YUV_BASE_RANK + 3; break; case V4L2_PIX_FMT_YUV410: /* YUV9, 9 bits per pixel */ rank = YUV_BASE_RANK + 2; break; case V4L2_PIX_FMT_YUV420: /* I420, 12 bits per pixel */ rank = YUV_BASE_RANK + 7; break; case V4L2_PIX_FMT_YUYV: /* YUY2, 16 bits per pixel */ rank = YUV_BASE_RANK + 10; break; case V4L2_PIX_FMT_YVU420: /* YV12, 12 bits per pixel */ rank = YUV_BASE_RANK + 6; break; case V4L2_PIX_FMT_UYVY: /* UYVY, 16 bits per pixel */ rank = YUV_BASE_RANK + 9; break; case V4L2_PIX_FMT_Y41P: /* Y41P, 12 bits per pixel */ rank = YUV_BASE_RANK + 5; break; case V4L2_PIX_FMT_YUV411P: /* Y41B, 12 bits per pixel */ rank = YUV_BASE_RANK + 4; break; case V4L2_PIX_FMT_YUV422P: /* Y42B, 16 bits per pixel */ rank = YUV_BASE_RANK + 8; break; case V4L2_PIX_FMT_DV: rank = DV_BASE_RANK; break; case V4L2_PIX_FMT_WNVA: /* Winnov hw compres */ rank = 0; break; #ifdef V4L2_PIX_FMT_SBGGR8 case V4L2_PIX_FMT_SBGGR8: rank = BAYER_BASE_RANK; break; #endif #ifdef V4L2_PIX_FMT_SN9C10X case V4L2_PIX_FMT_SN9C10X: rank = S910_BASE_RANK; break; #endif #ifdef V4L2_PIX_FMT_PWC1 case V4L2_PIX_FMT_PWC1: rank = PWC_BASE_RANK; break; #endif #ifdef V4L2_PIX_FMT_PWC2 case V4L2_PIX_FMT_PWC2: rank = PWC_BASE_RANK; break; #endif default: rank = 0; break; } /* All ranks are below 1<<15 so a shift by 15 * will a) make all non-emulated formats larger * than emulated and b) will not overflow */ if (!emulated) rank <<= 15; return rank; } static gint format_cmp_func (gconstpointer a, gconstpointer b) { const struct v4l2_fmtdesc *fa = a; const struct v4l2_fmtdesc *fb = b; if (fa->pixelformat == fb->pixelformat) return 0; return gst_v4l2_object_format_get_rank (fb) - gst_v4l2_object_format_get_rank (fa); } /****************************************************** * gst_v4l2_object_fill_format_list(): * create list of supported capture formats * return value: TRUE on success, FALSE on error ******************************************************/ static gboolean gst_v4l2_object_fill_format_list (GstV4l2Object * v4l2object) { gint n; struct v4l2_fmtdesc *format; GST_DEBUG_OBJECT (v4l2object->element, "getting src format enumerations"); /* format enumeration */ for (n = 0;; n++) { format = g_new0 (struct v4l2_fmtdesc, 1); format->index = n; format->type = v4l2object->type; if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUM_FMT, format) < 0) { if (errno == EINVAL) { g_free (format); break; /* end of enumeration */ } else { goto failed; } } GST_LOG_OBJECT (v4l2object->element, "index: %u", format->index); GST_LOG_OBJECT (v4l2object->element, "type: %d", format->type); GST_LOG_OBJECT (v4l2object->element, "flags: %08x", format->flags); GST_LOG_OBJECT (v4l2object->element, "description: '%s'", format->description); GST_LOG_OBJECT (v4l2object->element, "pixelformat: %" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (format->pixelformat)); /* sort formats according to our preference; we do this, because caps * are probed in the order the formats are in the list, and the order of * formats in the final probed caps matters for things like fixation */ v4l2object->formats = g_slist_insert_sorted (v4l2object->formats, format, (GCompareFunc) format_cmp_func); } #ifndef GST_DISABLE_GST_DEBUG { GSList *l; GST_INFO_OBJECT (v4l2object->element, "got %d format(s):", n); for (l = v4l2object->formats; l != NULL; l = l->next) { format = l->data; GST_INFO_OBJECT (v4l2object->element, " %" GST_FOURCC_FORMAT "%s", GST_FOURCC_ARGS (format->pixelformat), ((format->flags & V4L2_FMT_FLAG_EMULATED)) ? " (emulated)" : ""); } } #endif return TRUE; /* ERRORS */ failed: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, (_("Failed to enumerate possible video formats device '%s' can work with"), v4l2object->videodev), ("Failed to get number %d in pixelformat enumeration for %s. (%d - %s)", n, v4l2object->videodev, errno, g_strerror (errno))); g_free (format); return FALSE; } } /* * Get the list of supported capture formats, a list of * struct v4l2_fmtdesc. */ GSList * gst_v4l2_object_get_format_list (GstV4l2Object * v4l2object) { if (!v4l2object->formats) gst_v4l2_object_fill_format_list (v4l2object); return v4l2object->formats; } GstStructure * gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc) { GstStructure *structure = NULL; switch (fourcc) { case V4L2_PIX_FMT_MJPEG: /* Motion-JPEG */ #ifdef V4L2_PIX_FMT_PJPG case V4L2_PIX_FMT_PJPG: /* Progressive-JPEG */ #endif case V4L2_PIX_FMT_JPEG: /* JFIF JPEG */ structure = gst_structure_new ("image/jpeg", NULL); break; case V4L2_PIX_FMT_RGB332: case V4L2_PIX_FMT_RGB555: case V4L2_PIX_FMT_RGB555X: case V4L2_PIX_FMT_RGB565: case V4L2_PIX_FMT_RGB565X: case V4L2_PIX_FMT_RGB24: case V4L2_PIX_FMT_BGR24: case V4L2_PIX_FMT_RGB32: case V4L2_PIX_FMT_BGR32:{ guint depth = 0, bpp = 0; gint endianness = 0; guint32 r_mask = 0, b_mask = 0, g_mask = 0; switch (fourcc) { case V4L2_PIX_FMT_RGB332: bpp = depth = 8; endianness = G_BYTE_ORDER; /* 'like, whatever' */ r_mask = 0xe0; g_mask = 0x1c; b_mask = 0x03; break; case V4L2_PIX_FMT_RGB555: case V4L2_PIX_FMT_RGB555X: bpp = 16; depth = 15; endianness = fourcc == V4L2_PIX_FMT_RGB555X ? G_BIG_ENDIAN : G_LITTLE_ENDIAN; r_mask = 0x7c00; g_mask = 0x03e0; b_mask = 0x001f; break; case V4L2_PIX_FMT_RGB565: case V4L2_PIX_FMT_RGB565X: bpp = depth = 16; endianness = fourcc == V4L2_PIX_FMT_RGB565X ? G_BIG_ENDIAN : G_LITTLE_ENDIAN; r_mask = 0xf800; g_mask = 0x07e0; b_mask = 0x001f; break; case V4L2_PIX_FMT_RGB24: bpp = depth = 24; endianness = G_BIG_ENDIAN; r_mask = 0xff0000; g_mask = 0x00ff00; b_mask = 0x0000ff; break; case V4L2_PIX_FMT_BGR24: bpp = depth = 24; endianness = G_BIG_ENDIAN; r_mask = 0x0000ff; g_mask = 0x00ff00; b_mask = 0xff0000; break; case V4L2_PIX_FMT_RGB32: bpp = depth = 32; endianness = G_BIG_ENDIAN; r_mask = 0xff000000; g_mask = 0x00ff0000; b_mask = 0x0000ff00; break; case V4L2_PIX_FMT_BGR32: bpp = depth = 32; endianness = G_BIG_ENDIAN; r_mask = 0x000000ff; g_mask = 0x0000ff00; b_mask = 0x00ff0000; break; default: g_assert_not_reached (); break; } structure = gst_structure_new ("video/x-raw-rgb", "bpp", G_TYPE_INT, bpp, "depth", G_TYPE_INT, depth, "red_mask", G_TYPE_INT, r_mask, "green_mask", G_TYPE_INT, g_mask, "blue_mask", G_TYPE_INT, b_mask, "endianness", G_TYPE_INT, endianness, NULL); break; } case V4L2_PIX_FMT_GREY: /* 8 Greyscale */ structure = gst_structure_new ("video/x-raw-gray", "bpp", G_TYPE_INT, 8, NULL); break; case V4L2_PIX_FMT_YYUV: /* 16 YUV 4:2:2 */ case V4L2_PIX_FMT_HI240: /* 8 8-bit color */ /* FIXME: get correct fourccs here */ break; case V4L2_PIX_FMT_NV12: /* 12 Y/CbCr 4:2:0 */ case V4L2_PIX_FMT_NV21: /* 12 Y/CrCb 4:2:0 */ case V4L2_PIX_FMT_YVU410: case V4L2_PIX_FMT_YUV410: case V4L2_PIX_FMT_YUV420: /* I420/IYUV */ case V4L2_PIX_FMT_YUYV: case V4L2_PIX_FMT_YVU420: case V4L2_PIX_FMT_UYVY: case V4L2_PIX_FMT_Y41P: case V4L2_PIX_FMT_YUV422P: #ifdef V4L2_PIX_FMT_YVYU case V4L2_PIX_FMT_YVYU: #endif case V4L2_PIX_FMT_YUV411P:{ guint32 fcc = 0; switch (fourcc) { case V4L2_PIX_FMT_NV12: fcc = GST_MAKE_FOURCC ('N', 'V', '1', '2'); break; case V4L2_PIX_FMT_NV21: fcc = GST_MAKE_FOURCC ('N', 'V', '2', '1'); break; case V4L2_PIX_FMT_YVU410: fcc = GST_MAKE_FOURCC ('Y', 'V', 'U', '9'); break; case V4L2_PIX_FMT_YUV410: fcc = GST_MAKE_FOURCC ('Y', 'U', 'V', '9'); break; case V4L2_PIX_FMT_YUV420: fcc = GST_MAKE_FOURCC ('I', '4', '2', '0'); break; case V4L2_PIX_FMT_YUYV: fcc = GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'); break; case V4L2_PIX_FMT_YVU420: fcc = GST_MAKE_FOURCC ('Y', 'V', '1', '2'); break; case V4L2_PIX_FMT_UYVY: fcc = GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y'); break; case V4L2_PIX_FMT_Y41P: fcc = GST_MAKE_FOURCC ('Y', '4', '1', 'P'); break; case V4L2_PIX_FMT_YUV411P: fcc = GST_MAKE_FOURCC ('Y', '4', '1', 'B'); break; case V4L2_PIX_FMT_YUV422P: fcc = GST_MAKE_FOURCC ('Y', '4', '2', 'B'); break; #ifdef V4L2_PIX_FMT_YVYU case V4L2_PIX_FMT_YVYU: fcc = GST_MAKE_FOURCC ('Y', 'V', 'Y', 'U'); break; #endif default: g_assert_not_reached (); break; } structure = gst_structure_new ("video/x-raw-yuv", "format", GST_TYPE_FOURCC, fcc, NULL); break; } case V4L2_PIX_FMT_DV: structure = gst_structure_new ("video/x-dv", "systemstream", G_TYPE_BOOLEAN, TRUE, NULL); break; case V4L2_PIX_FMT_MPEG: /* MPEG */ structure = gst_structure_new ("video/mpegts", NULL); break; case V4L2_PIX_FMT_WNVA: /* Winnov hw compres */ break; #ifdef V4L2_PIX_FMT_SBGGR8 case V4L2_PIX_FMT_SBGGR8: structure = gst_structure_new ("video/x-raw-bayer", NULL); break; #endif #ifdef V4L2_PIX_FMT_SN9C10X case V4L2_PIX_FMT_SN9C10X: structure = gst_structure_new ("video/x-sonix", NULL); break; #endif #ifdef V4L2_PIX_FMT_PWC1 case V4L2_PIX_FMT_PWC1: structure = gst_structure_new ("video/x-pwc1", NULL); break; #endif #ifdef V4L2_PIX_FMT_PWC2 case V4L2_PIX_FMT_PWC2: structure = gst_structure_new ("video/x-pwc2", NULL); break; #endif default: GST_DEBUG ("Unknown fourcc 0x%08x %" GST_FOURCC_FORMAT, fourcc, GST_FOURCC_ARGS (fourcc)); break; } return structure; } GstCaps * gst_v4l2_object_get_all_caps (void) { static GstCaps *caps = NULL; if (caps == NULL) { GstStructure *structure; guint i; caps = gst_caps_new_empty (); for (i = 0; i < GST_V4L2_FORMAT_COUNT; i++) { structure = gst_v4l2_object_v4l2fourcc_to_structure (gst_v4l2_formats[i].format); if (structure) { if (gst_v4l2_formats[i].dimensions) { gst_structure_set (structure, "width", GST_TYPE_INT_RANGE, 1, GST_V4L2_MAX_SIZE, "height", GST_TYPE_INT_RANGE, 1, GST_V4L2_MAX_SIZE, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1, NULL); } gst_caps_append_structure (caps, structure); } } } return gst_caps_ref (caps); } /* collect data for the given caps * @caps: given input caps * @format: location for the v4l format * @w/@h: location for width and height * @fps_n/@fps_d: location for framerate * @size: location for expected size of the frame or 0 if unknown */ gboolean gst_v4l2_object_get_caps_info (GstV4l2Object * v4l2object, GstCaps * caps, struct v4l2_fmtdesc ** format, gint * w, gint * h, gboolean * interlaced, guint * fps_n, guint * fps_d, guint * size) { GstStructure *structure; const GValue *framerate; guint32 fourcc; const gchar *mimetype; guint outsize; /* default unknown values */ fourcc = 0; outsize = 0; structure = gst_caps_get_structure (caps, 0); mimetype = gst_structure_get_name (structure); if (strcmp (mimetype, "video/mpegts") == 0) { fourcc = V4L2_PIX_FMT_MPEG; *fps_n = 0; *fps_d = 1; goto done; } if (!gst_structure_get_int (structure, "width", w)) return FALSE; if (!gst_structure_get_int (structure, "height", h)) return FALSE; if (!gst_structure_get_boolean (structure, "interlaced", interlaced)) *interlaced = FALSE; framerate = gst_structure_get_value (structure, "framerate"); if (!framerate) return FALSE; *fps_n = gst_value_get_fraction_numerator (framerate); *fps_d = gst_value_get_fraction_denominator (framerate); if (!strcmp (mimetype, "video/x-raw-yuv")) { gst_structure_get_fourcc (structure, "format", &fourcc); switch (fourcc) { case GST_MAKE_FOURCC ('I', '4', '2', '0'): case GST_MAKE_FOURCC ('I', 'Y', 'U', 'V'): fourcc = V4L2_PIX_FMT_YUV420; outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h); outsize += 2 * ((GST_ROUND_UP_8 (*w) / 2) * (GST_ROUND_UP_2 (*h) / 2)); break; case GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'): fourcc = V4L2_PIX_FMT_YUYV; outsize = (GST_ROUND_UP_2 (*w) * 2) * *h; break; case GST_MAKE_FOURCC ('Y', '4', '1', 'P'): fourcc = V4L2_PIX_FMT_Y41P; outsize = (GST_ROUND_UP_2 (*w) * 2) * *h; break; case GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y'): fourcc = V4L2_PIX_FMT_UYVY; outsize = (GST_ROUND_UP_2 (*w) * 2) * *h; break; case GST_MAKE_FOURCC ('Y', 'V', '1', '2'): fourcc = V4L2_PIX_FMT_YVU420; outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h); outsize += 2 * ((GST_ROUND_UP_8 (*w) / 2) * (GST_ROUND_UP_2 (*h) / 2)); break; case GST_MAKE_FOURCC ('Y', '4', '1', 'B'): fourcc = V4L2_PIX_FMT_YUV411P; outsize = GST_ROUND_UP_4 (*w) * *h; outsize += 2 * ((GST_ROUND_UP_8 (*w) / 4) * *h); break; case GST_MAKE_FOURCC ('Y', '4', '2', 'B'): fourcc = V4L2_PIX_FMT_YUV422P; outsize = GST_ROUND_UP_4 (*w) * *h; outsize += 2 * ((GST_ROUND_UP_8 (*w) / 2) * *h); break; case GST_MAKE_FOURCC ('N', 'V', '1', '2'): fourcc = V4L2_PIX_FMT_NV12; outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h); outsize += (GST_ROUND_UP_4 (*w) * *h) / 2; break; case GST_MAKE_FOURCC ('N', 'V', '2', '1'): fourcc = V4L2_PIX_FMT_NV21; outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h); outsize += (GST_ROUND_UP_4 (*w) * *h) / 2; break; #ifdef V4L2_PIX_FMT_YVYU case GST_MAKE_FOURCC ('Y', 'V', 'Y', 'U'): fourcc = V4L2_PIX_FMT_YVYU; outsize = (GST_ROUND_UP_2 (*w) * 2) * *h; break; #endif } } else if (!strcmp (mimetype, "video/x-raw-rgb")) { gint depth, endianness, r_mask; gst_structure_get_int (structure, "depth", &depth); gst_structure_get_int (structure, "endianness", &endianness); gst_structure_get_int (structure, "red_mask", &r_mask); switch (depth) { case 8: fourcc = V4L2_PIX_FMT_RGB332; break; case 15: fourcc = (endianness == G_LITTLE_ENDIAN) ? V4L2_PIX_FMT_RGB555 : V4L2_PIX_FMT_RGB555X; break; case 16: fourcc = (endianness == G_LITTLE_ENDIAN) ? V4L2_PIX_FMT_RGB565 : V4L2_PIX_FMT_RGB565X; break; case 24: fourcc = (r_mask == 0xFF) ? V4L2_PIX_FMT_BGR24 : V4L2_PIX_FMT_RGB24; break; case 32: fourcc = (r_mask == 0xFF) ? V4L2_PIX_FMT_BGR32 : V4L2_PIX_FMT_RGB32; break; } } else if (strcmp (mimetype, "video/x-dv") == 0) { fourcc = V4L2_PIX_FMT_DV; } else if (strcmp (mimetype, "image/jpeg") == 0) { fourcc = V4L2_PIX_FMT_JPEG; #ifdef V4L2_PIX_FMT_SBGGR8 } else if (strcmp (mimetype, "video/x-raw-bayer") == 0) { fourcc = V4L2_PIX_FMT_SBGGR8; #endif #ifdef V4L2_PIX_FMT_SN9C10X } else if (strcmp (mimetype, "video/x-sonix") == 0) { fourcc = V4L2_PIX_FMT_SN9C10X; #endif #ifdef V4L2_PIX_FMT_PWC1 } else if (strcmp (mimetype, "video/x-pwc1") == 0) { fourcc = V4L2_PIX_FMT_PWC1; #endif #ifdef V4L2_PIX_FMT_PWC2 } else if (strcmp (mimetype, "video/x-pwc2") == 0) { fourcc = V4L2_PIX_FMT_PWC2; #endif } else if (strcmp (mimetype, "video/x-raw-gray") == 0) { fourcc = V4L2_PIX_FMT_GREY; } if (fourcc == 0) return FALSE; done: *format = gst_v4l2_object_get_format_from_fourcc (v4l2object, fourcc); *size = outsize; return TRUE; } static gboolean gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object, guint32 pixelformat, gint * width, gint * height, gboolean * interlaced); /* The frame interval enumeration code first appeared in Linux 2.6.19. */ #ifdef VIDIOC_ENUM_FRAMEINTERVALS static GstStructure * gst_v4l2_object_probe_caps_for_format_and_size (GstV4l2Object * v4l2object, guint32 pixelformat, guint32 width, guint32 height, const GstStructure * template) { gint fd = v4l2object->video_fd; struct v4l2_frmivalenum ival; guint32 num, denom; GstStructure *s; GValue rates = { 0, }; gboolean interlaced; gint int_width = width; gint int_height = height; /* interlaced detection using VIDIOC_TRY/S_FMT */ if (!gst_v4l2_object_get_nearest_size (v4l2object, pixelformat, &int_width, &int_height, &interlaced)) return NULL; memset (&ival, 0, sizeof (struct v4l2_frmivalenum)); ival.index = 0; ival.pixel_format = pixelformat; ival.width = width; ival.height = height; GST_LOG_OBJECT (v4l2object->element, "get frame interval for %ux%u, %" GST_FOURCC_FORMAT, width, height, GST_FOURCC_ARGS (pixelformat)); /* keep in mind that v4l2 gives us frame intervals (durations); we invert the * fraction to get framerate */ if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) < 0) goto enum_frameintervals_failed; if (ival.type == V4L2_FRMIVAL_TYPE_DISCRETE) { GValue rate = { 0, }; g_value_init (&rates, GST_TYPE_LIST); g_value_init (&rate, GST_TYPE_FRACTION); do { num = ival.discrete.numerator; denom = ival.discrete.denominator; if (num > G_MAXINT || denom > G_MAXINT) { /* let us hope we don't get here... */ num >>= 1; denom >>= 1; } GST_LOG_OBJECT (v4l2object->element, "adding discrete framerate: %d/%d", denom, num); /* swap to get the framerate */ gst_value_set_fraction (&rate, denom, num); gst_value_list_append_value (&rates, &rate); ival.index++; } while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) >= 0); } else if (ival.type == V4L2_FRMIVAL_TYPE_STEPWISE) { GValue min = { 0, }; GValue step = { 0, }; GValue max = { 0, }; gboolean added = FALSE; guint32 minnum, mindenom; guint32 maxnum, maxdenom; g_value_init (&rates, GST_TYPE_LIST); g_value_init (&min, GST_TYPE_FRACTION); g_value_init (&step, GST_TYPE_FRACTION); g_value_init (&max, GST_TYPE_FRACTION); /* get the min */ minnum = ival.stepwise.min.numerator; mindenom = ival.stepwise.min.denominator; if (minnum > G_MAXINT || mindenom > G_MAXINT) { minnum >>= 1; mindenom >>= 1; } GST_LOG_OBJECT (v4l2object->element, "stepwise min frame interval: %d/%d", minnum, mindenom); gst_value_set_fraction (&min, minnum, mindenom); /* get the max */ maxnum = ival.stepwise.max.numerator; maxdenom = ival.stepwise.max.denominator; if (maxnum > G_MAXINT || maxdenom > G_MAXINT) { maxnum >>= 1; maxdenom >>= 1; } GST_LOG_OBJECT (v4l2object->element, "stepwise max frame interval: %d/%d", maxnum, maxdenom); gst_value_set_fraction (&max, maxnum, maxdenom); /* get the step */ num = ival.stepwise.step.numerator; denom = ival.stepwise.step.denominator; if (num > G_MAXINT || denom > G_MAXINT) { num >>= 1; denom >>= 1; } if (num == 0 || denom == 0) { /* in this case we have a wrong fraction or no step, set the step to max * so that we only add the min value in the loop below */ num = maxnum; denom = maxdenom; } /* since we only have gst_value_fraction_subtract and not add, negate the * numerator */ GST_LOG_OBJECT (v4l2object->element, "stepwise step frame interval: %d/%d", num, denom); gst_value_set_fraction (&step, -num, denom); while (gst_value_compare (&min, &max) <= 0) { GValue rate = { 0, }; num = gst_value_get_fraction_numerator (&min); denom = gst_value_get_fraction_denominator (&min); GST_LOG_OBJECT (v4l2object->element, "adding stepwise framerate: %d/%d", denom, num); /* invert to get the framerate */ g_value_init (&rate, GST_TYPE_FRACTION); gst_value_set_fraction (&rate, denom, num); gst_value_list_append_value (&rates, &rate); added = TRUE; /* we're actually adding because step was negated above. This is because * there is no _add function... */ if (!gst_value_fraction_subtract (&min, &min, &step)) { GST_WARNING_OBJECT (v4l2object->element, "could not step fraction!"); break; } } if (!added) { /* no range was added, leave the default range from the template */ GST_WARNING_OBJECT (v4l2object->element, "no range added, leaving default"); g_value_unset (&rates); } } else if (ival.type == V4L2_FRMIVAL_TYPE_CONTINUOUS) { guint32 maxnum, maxdenom; g_value_init (&rates, GST_TYPE_FRACTION_RANGE); num = ival.stepwise.min.numerator; denom = ival.stepwise.min.denominator; if (num > G_MAXINT || denom > G_MAXINT) { num >>= 1; denom >>= 1; } maxnum = ival.stepwise.max.numerator; maxdenom = ival.stepwise.max.denominator; if (maxnum > G_MAXINT || maxdenom > G_MAXINT) { maxnum >>= 1; maxdenom >>= 1; } GST_LOG_OBJECT (v4l2object->element, "continuous frame interval %d/%d to %d/%d", maxdenom, maxnum, denom, num); gst_value_set_fraction_range_full (&rates, maxdenom, maxnum, denom, num); } else { goto unknown_type; } return_data: s = gst_structure_copy (template); gst_structure_set (s, "width", G_TYPE_INT, (gint) width, "height", G_TYPE_INT, (gint) height, "interlaced", G_TYPE_BOOLEAN, interlaced, "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1, NULL); if (G_IS_VALUE (&rates)) { /* only change the framerate on the template when we have a valid probed new * value */ gst_structure_set_value (s, "framerate", &rates); g_value_unset (&rates); } else { gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1, NULL); } return s; /* ERRORS */ enum_frameintervals_failed: { GST_DEBUG_OBJECT (v4l2object->element, "Unable to enumerate intervals for %" GST_FOURCC_FORMAT "@%ux%u", GST_FOURCC_ARGS (pixelformat), width, height); goto return_data; } unknown_type: { /* I don't see how this is actually an error, we ignore the format then */ GST_WARNING_OBJECT (v4l2object->element, "Unknown frame interval type at %" GST_FOURCC_FORMAT "@%ux%u: %u", GST_FOURCC_ARGS (pixelformat), width, height, ival.type); return NULL; } } #endif /* defined VIDIOC_ENUM_FRAMEINTERVALS */ #ifdef VIDIOC_ENUM_FRAMESIZES static gint sort_by_frame_size (GstStructure * s1, GstStructure * s2) { int w1, h1, w2, h2; gst_structure_get_int (s1, "width", &w1); gst_structure_get_int (s1, "height", &h1); gst_structure_get_int (s2, "width", &w2); gst_structure_get_int (s2, "height", &h2); /* I think it's safe to assume that this won't overflow for a while */ return ((w2 * h2) - (w1 * h1)); } #endif GstCaps * gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object, guint32 pixelformat, const GstStructure * template) { GstCaps *ret = gst_caps_new_empty (); GstStructure *tmp; #ifdef VIDIOC_ENUM_FRAMESIZES gint fd = v4l2object->video_fd; struct v4l2_frmsizeenum size; GList *results = NULL; guint32 w, h; if (pixelformat == GST_MAKE_FOURCC ('M', 'P', 'E', 'G')) return gst_caps_new_simple ("video/mpegts", NULL); memset (&size, 0, sizeof (struct v4l2_frmsizeenum)); size.index = 0; size.pixel_format = pixelformat; GST_DEBUG_OBJECT (v4l2object->element, "Enumerating frame sizes"); if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) < 0) goto enum_framesizes_failed; if (size.type == V4L2_FRMSIZE_TYPE_DISCRETE) { do { GST_LOG_OBJECT (v4l2object->element, "got discrete frame size %dx%d", size.discrete.width, size.discrete.height); w = MIN (size.discrete.width, G_MAXINT); h = MIN (size.discrete.height, G_MAXINT); if (w && h) { tmp = gst_v4l2_object_probe_caps_for_format_and_size (v4l2object, pixelformat, w, h, template); if (tmp) results = g_list_prepend (results, tmp); } size.index++; } while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) >= 0); GST_DEBUG_OBJECT (v4l2object->element, "done iterating discrete frame sizes"); } else if (size.type == V4L2_FRMSIZE_TYPE_STEPWISE) { GST_DEBUG_OBJECT (v4l2object->element, "we have stepwise frame sizes:"); GST_DEBUG_OBJECT (v4l2object->element, "min width: %d", size.stepwise.min_width); GST_DEBUG_OBJECT (v4l2object->element, "min height: %d", size.stepwise.min_height); GST_DEBUG_OBJECT (v4l2object->element, "max width: %d", size.stepwise.max_width); GST_DEBUG_OBJECT (v4l2object->element, "min height: %d", size.stepwise.max_height); GST_DEBUG_OBJECT (v4l2object->element, "step width: %d", size.stepwise.step_width); GST_DEBUG_OBJECT (v4l2object->element, "step height: %d", size.stepwise.step_height); for (w = size.stepwise.min_width, h = size.stepwise.min_height; w < size.stepwise.max_width && h < size.stepwise.max_height; w += size.stepwise.step_width, h += size.stepwise.step_height) { if (w == 0 || h == 0) continue; tmp = gst_v4l2_object_probe_caps_for_format_and_size (v4l2object, pixelformat, w, h, template); if (tmp) results = g_list_prepend (results, tmp); } GST_DEBUG_OBJECT (v4l2object->element, "done iterating stepwise frame sizes"); } else if (size.type == V4L2_FRMSIZE_TYPE_CONTINUOUS) { guint32 maxw, maxh; GST_DEBUG_OBJECT (v4l2object->element, "we have continuous frame sizes:"); GST_DEBUG_OBJECT (v4l2object->element, "min width: %d", size.stepwise.min_width); GST_DEBUG_OBJECT (v4l2object->element, "min height: %d", size.stepwise.min_height); GST_DEBUG_OBJECT (v4l2object->element, "max width: %d", size.stepwise.max_width); GST_DEBUG_OBJECT (v4l2object->element, "min height: %d", size.stepwise.max_height); w = MAX (size.stepwise.min_width, 1); h = MAX (size.stepwise.min_height, 1); maxw = MIN (size.stepwise.max_width, G_MAXINT); maxh = MIN (size.stepwise.max_height, G_MAXINT); tmp = gst_v4l2_object_probe_caps_for_format_and_size (v4l2object, pixelformat, w, h, template); if (tmp) { gst_structure_set (tmp, "width", GST_TYPE_INT_RANGE, (gint) w, (gint) maxw, "height", GST_TYPE_INT_RANGE, (gint) h, (gint) maxh, NULL); /* no point using the results list here, since there's only one struct */ gst_caps_append_structure (ret, tmp); } } else { goto unknown_type; } /* we use an intermediary list to store and then sort the results of the * probing because we can't make any assumptions about the order in which * the driver will give us the sizes, but we want the final caps to contain * the results starting with the highest resolution and having the lowest * resolution last, since order in caps matters for things like fixation. */ results = g_list_sort (results, (GCompareFunc) sort_by_frame_size); while (results != NULL) { gst_caps_append_structure (ret, GST_STRUCTURE (results->data)); results = g_list_delete_link (results, results); } if (gst_caps_is_empty (ret)) goto enum_framesizes_no_results; return ret; /* ERRORS */ enum_framesizes_failed: { /* I don't see how this is actually an error */ GST_DEBUG_OBJECT (v4l2object->element, "Failed to enumerate frame sizes for pixelformat %" GST_FOURCC_FORMAT " (%s)", GST_FOURCC_ARGS (pixelformat), g_strerror (errno)); goto default_frame_sizes; } enum_framesizes_no_results: { /* it's possible that VIDIOC_ENUM_FRAMESIZES is defined but the driver in * question doesn't actually support it yet */ GST_DEBUG_OBJECT (v4l2object->element, "No results for pixelformat %" GST_FOURCC_FORMAT " enumerating frame sizes, trying fallback", GST_FOURCC_ARGS (pixelformat)); goto default_frame_sizes; } unknown_type: { GST_WARNING_OBJECT (v4l2object->element, "Unknown frame sizeenum type for pixelformat %" GST_FOURCC_FORMAT ": %u", GST_FOURCC_ARGS (pixelformat), size.type); goto default_frame_sizes; } default_frame_sizes: #endif /* defined VIDIOC_ENUM_FRAMESIZES */ { gint min_w, max_w, min_h, max_h, fix_num = 0, fix_denom = 0; gboolean interlaced; /* This code is for Linux < 2.6.19 */ min_w = min_h = 1; max_w = max_h = GST_V4L2_MAX_SIZE; if (!gst_v4l2_object_get_nearest_size (v4l2object, pixelformat, &min_w, &min_h, &interlaced)) { GST_WARNING_OBJECT (v4l2object->element, "Could not probe minimum capture size for pixelformat %" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (pixelformat)); } if (!gst_v4l2_object_get_nearest_size (v4l2object, pixelformat, &max_w, &max_h, &interlaced)) { GST_WARNING_OBJECT (v4l2object->element, "Could not probe maximum capture size for pixelformat %" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (pixelformat)); } /* Since we can't get framerate directly, try to use the current norm */ if (v4l2object->tv_norm && v4l2object->norms) { GList *norms; GstTunerNorm *norm = NULL; GstTunerNorm *current = gst_v4l2_tuner_get_norm_by_std_id (v4l2object, v4l2object->tv_norm); for (norms = v4l2object->norms; norms != NULL; norms = norms->next) { norm = (GstTunerNorm *) norms->data; if (!strcmp (norm->label, current->label)) break; } /* If it's possible, set framerate to that (discrete) value */ if (norm) { fix_num = gst_value_get_fraction_numerator (&norm->framerate); fix_denom = gst_value_get_fraction_denominator (&norm->framerate); } } tmp = gst_structure_copy (template); if (fix_num) { gst_structure_set (tmp, "framerate", GST_TYPE_FRACTION, fix_num, fix_denom, NULL); } else { /* if norm can't be used, copy the template framerate */ gst_structure_set (tmp, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1, NULL); } if (min_w == max_w) gst_structure_set (tmp, "width", G_TYPE_INT, max_w, NULL); else gst_structure_set (tmp, "width", GST_TYPE_INT_RANGE, min_w, max_w, NULL); if (min_h == max_h) gst_structure_set (tmp, "height", G_TYPE_INT, max_h, NULL); else gst_structure_set (tmp, "height", GST_TYPE_INT_RANGE, min_h, max_h, NULL); gst_structure_set (tmp, "interlaced", G_TYPE_BOOLEAN, interlaced, NULL); gst_structure_set (tmp, "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1, NULL); gst_caps_append_structure (ret, tmp); return ret; } } static gboolean gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object, guint32 pixelformat, gint * width, gint * height, gboolean * interlaced) { struct v4l2_format fmt, prevfmt; int fd; int r; int prevfmt_valid; g_return_val_if_fail (width != NULL, FALSE); g_return_val_if_fail (height != NULL, FALSE); GST_LOG_OBJECT (v4l2object->element, "getting nearest size to %dx%d with format %" GST_FOURCC_FORMAT, *width, *height, GST_FOURCC_ARGS (pixelformat)); fd = v4l2object->video_fd; /* Some drivers are buggy and will modify the currently set format when processing VIDIOC_TRY_FMT, so we remember what is set at the minute, and will reset it when done. */ prevfmt_valid = (v4l2_ioctl (fd, VIDIOC_G_FMT, &prevfmt) >= 0); /* get size delimiters */ memset (&fmt, 0, sizeof (fmt)); fmt.type = v4l2object->type; fmt.fmt.pix.width = *width; fmt.fmt.pix.height = *height; fmt.fmt.pix.pixelformat = pixelformat; fmt.fmt.pix.field = V4L2_FIELD_NONE; r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt); if (r < 0 && errno == EINVAL) { /* try again with interlaced video */ fmt.fmt.pix.width = *width; fmt.fmt.pix.height = *height; fmt.fmt.pix.pixelformat = pixelformat; fmt.fmt.pix.field = V4L2_FIELD_INTERLACED; r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt); } if (r < 0) { /* The driver might not implement TRY_FMT, in which case we will try S_FMT to probe */ if (errno != ENOTTY) goto error; /* Only try S_FMT if we're not actively capturing yet, which we shouldn't be, because we're still probing */ if (GST_V4L2_IS_ACTIVE (v4l2object)) goto error; GST_LOG_OBJECT (v4l2object->element, "Failed to probe size limit with VIDIOC_TRY_FMT, trying VIDIOC_S_FMT"); fmt.fmt.pix.width = *width; fmt.fmt.pix.height = *height; r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt); if (r < 0 && errno == EINVAL) { /* try again with progressive video */ fmt.fmt.pix.width = *width; fmt.fmt.pix.height = *height; fmt.fmt.pix.pixelformat = pixelformat; fmt.fmt.pix.field = V4L2_FIELD_NONE; r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt); } if (r < 0) goto error; } GST_LOG_OBJECT (v4l2object->element, "got nearest size %dx%d", fmt.fmt.pix.width, fmt.fmt.pix.height); *width = fmt.fmt.pix.width; *height = fmt.fmt.pix.height; switch (fmt.fmt.pix.field) { case V4L2_FIELD_ANY: case V4L2_FIELD_NONE: *interlaced = FALSE; break; case V4L2_FIELD_INTERLACED: case V4L2_FIELD_INTERLACED_TB: case V4L2_FIELD_INTERLACED_BT: *interlaced = TRUE; break; default: GST_WARNING_OBJECT (v4l2object->element, "Unsupported field type for %" GST_FOURCC_FORMAT "@%ux%u", GST_FOURCC_ARGS (pixelformat), *width, *height); goto error; } if (prevfmt_valid) v4l2_ioctl (fd, VIDIOC_S_FMT, &prevfmt); return TRUE; error: if (prevfmt_valid) v4l2_ioctl (fd, VIDIOC_S_FMT, &prevfmt); return FALSE; } gboolean gst_v4l2_object_set_format (GstV4l2Object * v4l2object, guint32 pixelformat, guint32 width, guint32 height, gboolean interlaced) { gint fd = v4l2object->video_fd; struct v4l2_format format; enum v4l2_field field; if (interlaced) { GST_DEBUG_OBJECT (v4l2object->element, "interlaced video"); /* ideally we would differentiate between types of interlaced video * but there is not sufficient information in the caps.. */ field = V4L2_FIELD_INTERLACED; } else { GST_DEBUG_OBJECT (v4l2object->element, "progressive video"); field = V4L2_FIELD_NONE; } GST_DEBUG_OBJECT (v4l2object->element, "Setting format to %dx%d, format " "%" GST_FOURCC_FORMAT, width, height, GST_FOURCC_ARGS (pixelformat)); GST_V4L2_CHECK_OPEN (v4l2object); GST_V4L2_CHECK_NOT_ACTIVE (v4l2object); /* Only unconditionally accept mpegts for sources */ if ((v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) && (pixelformat == GST_MAKE_FOURCC ('M', 'P', 'E', 'G'))) return TRUE; memset (&format, 0x00, sizeof (struct v4l2_format)); format.type = v4l2object->type; if (v4l2_ioctl (fd, VIDIOC_G_FMT, &format) < 0) goto get_fmt_failed; if (format.type == v4l2object->type && format.fmt.pix.width == width && format.fmt.pix.height == height && format.fmt.pix.pixelformat == pixelformat && format.fmt.pix.field == field) { /* Nothing to do. We want to succeed immediately * here because setting the same format back * can still fail due to EBUSY. By short-circuiting * here, we allow pausing and re-playing pipelines * with changed caps, as long as the changed caps * do not change the webcam's format. Otherwise, * any caps change would require us to go to NULL * state to close the device and set format. */ return TRUE; } format.type = v4l2object->type; format.fmt.pix.width = width; format.fmt.pix.height = height; format.fmt.pix.pixelformat = pixelformat; format.fmt.pix.field = field; if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0) { goto set_fmt_failed; } if (format.fmt.pix.width != width || format.fmt.pix.height != height) goto invalid_dimensions; if (format.fmt.pix.pixelformat != pixelformat) goto invalid_pixelformat; return TRUE; /* ERRORS */ get_fmt_failed: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, (_("Device '%s' does not support video capture"), v4l2object->videodev), ("Call to G_FMT failed: (%s)", g_strerror (errno))); return FALSE; } set_fmt_failed: { if (errno == EBUSY) { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, BUSY, (_("Device '%s' is busy"), v4l2object->videodev), ("Call to S_FMT failed for %" GST_FOURCC_FORMAT " @ %dx%d: %s", GST_FOURCC_ARGS (pixelformat), width, height, g_strerror (errno))); } else { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, (_("Device '%s' cannot capture at %dx%d"), v4l2object->videodev, width, height), ("Call to S_FMT failed for %" GST_FOURCC_FORMAT " @ %dx%d: %s", GST_FOURCC_ARGS (pixelformat), width, height, g_strerror (errno))); } return FALSE; } invalid_dimensions: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, (_("Device '%s' cannot capture at %dx%d"), v4l2object->videodev, width, height), ("Tried to capture at %dx%d, but device returned size %dx%d", width, height, format.fmt.pix.width, format.fmt.pix.height)); return FALSE; } invalid_pixelformat: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, (_("Device '%s' cannot capture in the specified format"), v4l2object->videodev), ("Tried to capture in %" GST_FOURCC_FORMAT ", but device returned format" " %" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (pixelformat), GST_FOURCC_ARGS (format.fmt.pix.pixelformat))); return FALSE; } } gboolean gst_v4l2_object_start_streaming (GstV4l2Object * v4l2object) { if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_STREAMON, &(v4l2object->type)) < 0) { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ, (_("Error starting streaming on device '%s'."), v4l2object->videodev), GST_ERROR_SYSTEM); return FALSE; } return TRUE; } gboolean gst_v4l2_object_stop_streaming (GstV4l2Object * v4l2object) { if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_STREAMOFF, &(v4l2object->type)) < 0) { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ, (_("Error stopping streaming on device '%s'."), v4l2object->videodev), GST_ERROR_SYSTEM); return FALSE; } return TRUE; }